Delete long-expired GlobalSdch field trial.

BUG=229940

Review URL: https://chromiumcodereview.appspot.com/16115002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@202728 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 0 insertions, 57 deletions

diff --git a/chrome/browser/chrome_browser_main.cc b/chrome/browser/chrome_browser_main.cc
index cfb1378..b832799 100644
--- a/chrome/browser/chrome_browser_main.cc
+++ b/chrome/browser/chrome_browser_main.cc
@@ -1402,24 +1402,6 @@ int ChromeBrowserMainParts::PreMainMessageLoopRunImpl() {
     if (!sdch_enabled)
       net::SdchManager::EnableSdchSupport(false);
   }
-  if (sdch_enabled) {
-    // Perform A/B test to measure global impact of SDCH support.
-    // Set up a field trial to see what disabling SDCH does to latency of page
-    // layout globally.
-    base::FieldTrial::Probability kSDCH_DIVISOR = 1000;
-    base::FieldTrial::Probability kSDCH_DISABLE_PROBABILITY = 1;  // 0.1% prob.
-    // After March 31, 2012 builds, it will always be in default group.
-    int sdch_enabled_group = -1;
-    scoped_refptr<base::FieldTrial> sdch_trial(
-        base::FieldTrialList::FactoryGetFieldTrial(
-            "GlobalSdch", kSDCH_DIVISOR, "global_enable_sdch", 2012, 3, 31,
-            &sdch_enabled_group));
-
-    sdch_trial->AppendGroup("global_disable_sdch",
-                            kSDCH_DISABLE_PROBABILITY);
-    if (sdch_enabled_group != sdch_trial->group())
-      net::SdchManager::EnableSdchSupport(false);
-  }
 
   if (parsed_command_line().HasSwitch(switches::kEnableWatchdog))
     InstallJankometer(parsed_command_line());
diff --git a/chrome/renderer/page_load_histograms.cc b/chrome/renderer/page_load_histograms.cc
index 6c5747a..26f798b 100644
--- a/chrome/renderer/page_load_histograms.cc
+++ b/chrome/renderer/page_load_histograms.cc
@@ -411,45 +411,6 @@ void PageLoadHistograms::Dump(WebFrame* frame) {
                   begin_to_finish_all_loads);
   }
 
-  // Histograms to determine if SDCH has an impact.
-  // TODO(jar): Consider removing per-link load types and the enumeration.
-  static const bool use_sdch_histogram =
-      base::FieldTrialList::TrialExists("GlobalSdch");
-  if (use_sdch_histogram) {
-    UMA_HISTOGRAM_ENUMERATION(
-        base::FieldTrial::MakeName("PLT.LoadType", "GlobalSdch"),
-        load_type, DocumentState::kLoadTypeMax);
-    switch (load_type) {
-      case DocumentState::NORMAL_LOAD:
-        PLT_HISTOGRAM(base::FieldTrial::MakeName(
-            "PLT.BeginToFinish_NormalLoad", "GlobalSdch"),
-            begin_to_finish_all_loads);
-        break;
-      case DocumentState::LINK_LOAD_NORMAL:
-        PLT_HISTOGRAM(base::FieldTrial::MakeName(
-            "PLT.BeginToFinish_LinkLoadNormal", "GlobalSdch"),
-            begin_to_finish_all_loads);
-        break;
-      case DocumentState::LINK_LOAD_RELOAD:
-        PLT_HISTOGRAM(base::FieldTrial::MakeName(
-            "PLT.BeginToFinish_LinkLoadReload", "GlobalSdch"),
-            begin_to_finish_all_loads);
-        break;
-      case DocumentState::LINK_LOAD_CACHE_STALE_OK:
-        PLT_HISTOGRAM(base::FieldTrial::MakeName(
-            "PLT.BeginToFinish_LinkLoadStaleOk", "GlobalSdch"),
-            begin_to_finish_all_loads);
-        break;
-      case DocumentState::LINK_LOAD_CACHE_ONLY:
-        PLT_HISTOGRAM(base::FieldTrial::MakeName(
-            "PLT.BeginToFinish_LinkLoadCacheOnly", "GlobalSdch"),
-            begin_to_finish_all_loads);
-        break;
-      default:
-        break;
-    }
-  }
-
   // TODO(mpcomplete): remove the extension-related histograms after we collect
   // enough data. http://crbug.com/100411
   const bool use_adblock_histogram =